JP3354251B2 - Valve train for internal combustion engine - Google Patents
Valve train for internal combustion engineInfo
- Publication number
- JP3354251B2 JP3354251B2 JP32841793A JP32841793A JP3354251B2 JP 3354251 B2 JP3354251 B2 JP 3354251B2 JP 32841793 A JP32841793 A JP 32841793A JP 32841793 A JP32841793 A JP 32841793A JP 3354251 B2 JP3354251 B2 JP 3354251B2
- Authority
- JP
- Japan
- Prior art keywords
- switching
- rocker arm
- piston
- rocker
- cam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Valve Device For Special Equipments (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は，揺動軸線を共通にして
隣接配置される複数のロッカアームと，それらのロッカ
アームに個別に対応してカム軸に設けられる複数のカム
と，各ロッカアームの連結および連結解除の組合せを切
換可能な連結切換手段とを備える内燃機関の動弁装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of rocker arms arranged adjacent to each other with a common swing axis, a plurality of cams provided on a cam shaft individually corresponding to the rocker arms, and a connection of each rocker arm. And a connection switching means capable of switching a combination of connection release.
【０００２】[0002]
【従来の技術】従来，かかる動弁装置は，たとえば特開
昭６３−１００２１０号公報等により既に知られてい
る。2. Description of the Related Art Conventionally, such a valve train is already known, for example, from Japanese Patent Application Laid-Open No. 63-100210.
【０００３】[0003]
【発明が解決しようとする課題】上記従来のものの連結
切換手段は，各ロッカアームに摺動自在に嵌合されると
ともに相互に連接された切換部材の軸方向一側から油圧
を作用せしめるとともに，前記油圧室に作用せしめる油
圧を複数段に切換えることにより各切換部材の摺動スト
ロークを複数段に切換えることを可能とすべく各切換部
材の軸方向他側に作用する戻しばねのばね特性を複数段
階に変化させるようにしており，この場合に，切換部材
の各摺動ストローク段で隣接ロッカアームとの連結およ
び連結解除を切換えることを可能とすべく，切換部材を
段付き形状に形成する必要があったため，加工が煩雑と
なる問題があった。The above-described conventional connection switching means is slidably fitted to each rocker arm and applies hydraulic pressure from one axial side of the mutually connected switching members. By changing the hydraulic pressure applied to the hydraulic chamber to a plurality of stages, the sliding stroke of each switching member can be switched to a plurality of stages. In this case, it is necessary to form the switching member in a stepped shape in order to be able to switch between connection and disconnection with the adjacent rocker arm at each sliding stroke of the switching member. Therefore, there is a problem that the processing is complicated.
【０００４】また従来の内燃機関の休止機構付き動弁装
置においては，一部の機関弁だけを休止させるように構
成されていたので，該一部の機関弁に偏って燃料やカー
ボンが堆積し易い問題があった。Further, in a conventional valve train with a deactivation mechanism for an internal combustion engine, only a part of the engine valves is deactivated, so that fuel or carbon accumulates in some of the engine valves. There was an easy problem.
【０００５】本発明は，かかる事情に鑑みてなされたも
のであり，切換部材を単純形状に形成して加工容易とし
た上で，更に休止可能な機関弁を選択的に切換制御可能
として，一部の機関弁だけに燃料やカーボンが偏って堆
積するのを抑制できるようにした，内燃機関の動弁装置
を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been made in consideration of the above. It is an object of the present invention to provide a valve operating device for an internal combustion engine, which is capable of suppressing the uneven accumulation of fuel and carbon only in a part of an engine valve.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に，請求項１記載の発明は，第１機関弁に連動，連結さ
れた第１ロッカアームと，この第１ロッカアームに隣接
配置された第２ロッカアームと，第２機関弁に連動，連
結されて第１ロッカアームとは反対側で第２ロッカアー
ムに隣接配置された第３ロッカアームとが，揺動軸線を
共通にして機関本体に揺動可能に支持され，その第１ロ
ッカアームに対応した第１の休止カムと，第２ロッカア
ームに対応した作動カムと，第３ロッカアームに対応し
た第２の休止カムとが共通のカム軸に設けられ，各ロッ
カアームの連結および連結解除の組合せを連結切換手段
により切換可能とした内燃機関の動弁装置であって，連
結切換手段は，第１ロッカアームのガイド孔に摺動自在
に嵌合されて一端を油圧室に臨ませた切換ピストンと，
第２ロッカアームの両端開放のガイド孔よりも長く 形成
されてそのガイド孔に摺動自在に嵌合されると共に切換
ピストンの他端に一端を当接させる切換ピンと，第３ロ
ッカアームのガイド孔に摺動自在に嵌合されるとともに
切換ピンの他端に当接される規制部材と，切換ピスト
ン，切換ピン及び規制部材が，油圧室の油圧解放状態で
は油圧室３３側に最大限後退した第１切換位置に，また
油圧室への比較的低圧の油圧作用状態では第１切換位置
から所定距離前進移動した第２切換位置に，更に比較的
高圧の油圧作用状態では第２切換位置から更に前進移動
した第３切換位置にそれぞれ切換わることを可能とした
ばね力で規制部材を油圧室側に付勢して第３ロッカアー
ムに設けられるばね付勢機構とを備え，切換ピストン，
切換ピン及び規制部材は，それらが第１切換位置にある
ときには，切換ピンの一端が第１ロッカアームのガイド
孔に嵌合し且つ切換ピンの他端および規制部材の当接面
が第２および第３ロッカアーム間に位置しており，また
第２切換位置にあるときには，切換ピンの一端および切
換ピストンの当接面が第１および第２ロッカアーム間に
位置し且つ切換ピンの他端が第３ロッカアームのガイド
孔に嵌合しており，さらに第３切換位置にあるときに
は，切換ピストンの他端が第２ロッカアームのガイド孔
に嵌合し且つ切換ピンの他端が第３ロッカアームのガイ
ド孔内に嵌合していることを特徴とする。To achieve the above Purpose SUMMARY OF THE INVENTION The invention of Claim 1 wherein is linked to a first engine valve, a first rocker arm connected, disposed adjacent to the first rocker arm The second rocker arm and a third rocker arm interlocked with and connected to the second engine valve and arranged adjacent to the second rocker arm on the side opposite to the first rocker arm can swing on the engine body with a common swing axis. And a first rest cam corresponding to the first rocker arm, an operation cam corresponding to the second rocker arm, and a second rest cam corresponding to the third rocker arm are provided on a common cam shaft. a valve operating device of connection and connecting the release of the combined switching means switchable by a an internal combustion engine of the rocker arm, connecting switching means is slidably fitted in the guide hole of the first rocker arm end A switching piston to face the hydraulic pressure chamber,
Formed longer than the guide holes that are open at both ends of the second rocker arm
It has been a switching pin to abut one end to the other end of the slidably fitted Rutotomoni switching piston to the guide hole, the other end of the switching pin with, slidably fitted to a third rocker arm guide hole a regulating member that is brought into contact with the switching piston
When the hydraulic pin, switching pin and regulating member are
Is in the first switching position, which is retracted as far as possible to the hydraulic chamber 33 side, and
In the state of relatively low pressure hydraulic action to the hydraulic chamber, the first switching position
To the second switching position, which has moved forward a predetermined distance from
Moves further forward from the second switching position in the high-pressure hydraulic operation state
A spring biasing mechanism provided on the third rocker arm by biasing the regulating member toward the hydraulic chamber with a spring force capable of switching to the third switching position .
The switching pin and the regulating member are in the first switching position
Sometimes, one end of the switching pin is guided by the first rocker arm.
The other end of the switching pin and the contact surface of the regulating member
Is located between the second and third rocker arms, and
When in the second switching position, one end of the switching pin and
The contact surface of the replacement piston is between the first and second rocker arms.
And the other end of the switching pin is located on the third rocker arm guide.
When it is fitted in the hole and in the third switching position
The other end of the switching piston is the guide hole of the second rocker arm.
And the other end of the switching pin is connected to the third rocker arm guide.
It is characterized in that it is fitted in the hole .
【０００７】また請求項２記載の発明は，第１機関弁に
連動，連結された第１ロッカアームと，この第１ロッカ
アームに隣接配置された第２ロッカアームと，第２機関
弁に連動，連結されて第１ロッカアームとは反対側で第
２ロッカアームに隣接配置された第３ロッカアームと
が，揺動軸線を共通にして機関本体に揺動可能に支持さ
れ，その第１ロッカアームに対応した第１の休止カム
と，第２ロッカアームに対応した作動カムと，第３ロッ
カアームに対応した第２の休止カムとが共通のカム軸に
設けられ，各ロッカアームの連結および連結解除の組合
せを連結切換手段により切換可能とした内燃機関の動弁
装置であって，連結切換手段は，第１ロッカアームに摺
動自在に嵌合されて外端を第１油圧室に臨ませる第１切
換ピストンと，第３ロッカアームに摺動自在に嵌合され
て外端を第２油圧室に臨ませる第２切換ピストンと，第
２ロッカアームに摺動自在に嵌合されて第１切換ピスト
ンの内端に一端が当接する第１切換部材と，同じく第２
ロッカアームに摺動自在に嵌合されて第２切換ピストン
の内端に一端が当接する第２切換部材と，第２ロッカア
ームに設けられて第１切換部材を第１切換ピストン側へ
付勢し，また第２切換部材を第２切換ピストン側へ付勢
するばね付勢手段と，第２ロッカアームに設けられて第
１切換部材の第２切換部材側への移動限界位置を規定
し，また第２切換部材の第１切換部材側への移動限界位
置を規定するストッパ手段とを備え，第１油圧室の油圧
解放状態では，ばね付勢手段の付勢力で，第１切換部材
が第１及び第２ロッカアームの両方に嵌合する位置に保
持され，また第１油圧室の油圧作用状態では，その油圧
で第１切換部材がそれの前記移動限界位置に保持され
て，該第１切換部材と第１切換ピストンとの当接面を第
１および第２ロッカアーム間に位置させ，更に第２油圧
室の油圧解放状態では，ばね付勢手段の付勢力で，第２
切換部材が第２及び第３ロッカアームの両方に嵌合する
位置に保持され，更にまた第２油圧室の油圧作用状態で
は，その油圧で第２切換部材がそれの前記移動限界位置
に保持されて，該第２切換部材と第２切換ピストンとの
当接面を第２及び第３ロッカアーム間に位置させるよう
にしたことを特徴とする。According to a second aspect of the present invention, there is provided a first rocker arm interlocked and connected to the first engine valve, a second rocker arm disposed adjacent to the first rocker arm, and an interlocking and connected to the second engine valve. And a third rocker arm disposed adjacent to the second rocker arm on the side opposite to the first rocker arm, is swingably supported by the engine body with a common swing axis, and a first rocker arm corresponding to the first rocker arm. A rest cam, an operation cam corresponding to the second rocker arm, and a second rest cam corresponding to the third rocker arm are provided on a common cam shaft, and a combination of connection and disconnection of each rocker arm is switched by connection switching means. a valve operating device capable with an internal combustion engine, the connection selection means, sliding in the first rocker arm
A first switching piston movably fitted and having an outer end facing the first hydraulic chamber, and a second switching piston slidably fitted to the third rocker arm and having the outer end facing the second hydraulic chamber. A first switching member slidably fitted to the second rocker arm and having one end abutting against the inner end of the first switching piston ;
The second switching piston is slidably fitted to the rocker arm.
A second switching member whose one end abuts against the inner end of the second rocker
The first switching member is provided to the first switching piston side.
Urges the second switching member toward the second switching piston.
Spring biasing means, and a second
Defines the limit position for the movement of 1 switching member to the 2nd switching member
Movement limit position of the second switching member toward the first switching member.
Stopper means for regulating the hydraulic pressure of the first hydraulic chamber.
In the released state, the first switching member is actuated by the urging force of the spring urging means.
In position to fit both the first and second rocker arms.
And in the hydraulic working state of the first hydraulic chamber,
The first switching member is held in its movement limit position.
The contact surface between the first switching member and the first switching piston is
Between the first and second rocker arms, and the second hydraulic
When the hydraulic pressure in the chamber is released, the urging force of the spring urging means
Switching member fits into both second and third rocker arms
Position, and also in the hydraulic working state of the second hydraulic chamber
Means that at the hydraulic pressure, the second switching member is
Between the second switching member and the second switching piston.
The contact surface is located between the second and third rocker arms.
Characterized in that the.
【０００８】[0008]
【実施例】以下，図面により本発明の実施例について説
明する。Embodiments of the present invention will be described below with reference to the drawings.
【０００９】図１ないし図３は本発明の第１実施例を示
すものであり，図１は縦断側面図であって図２の１−１
線断面図，図２は図１の２−２線矢視平面図，図３は図
１の３−３線断面図である。FIGS. 1 to 3 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional side view, and FIG.
2 is a plan view taken along line 2-2 of FIG. 1, and FIG. 3 is a sectional view taken along line 3-3 of FIG.
【００１０】機関本体Ｅに設けられた一対の機関弁とし
ての吸気弁Ｖ1 ，Ｖ2 は，機関の回転に同期して１／２
の回転比で駆動されるカム軸２１に一体に設けられた休
止カム２２，実質休止カム２３および作動カム２４と，
カム軸２１と平行である共通な揺動軸線まわりに揺動可
能として隣接配置される第１，第２および第３ロッカア
ーム２５，２６，２７との働きによって開閉作動され
る。而して前記休止カム２２は本発明の第２の休止カム
を，また前記実質休止カム２３は本発明の第１の休止カ
ムをそれぞれ構成する。The intake valves V 1 and V 2 as a pair of engine valves provided in the engine body E are halved in synchronization with the rotation of the engine.
A rest cam 22, a substantial rest cam 23 and an operation cam 24 provided integrally with a cam shaft 21 driven at a rotation ratio of
The opening and closing operation is performed by the first, second, and third rocker arms 25, 26, and 27 that are arranged adjacent to each other so as to be swingable around a common swing axis that is parallel to the cam shaft 21. Thus, the rest cam 22 constitutes the second rest cam of the present invention, and the substantial rest cam 23 constitutes the first rest cam of the present invention.
【００１１】カム軸２１は機関本体Ｅの上方で回転自在
に配設されており，このカム軸２１には，休止カム２
２，実質休止カム２３および作動カム２４が，休止カム
２２および実質休止カム２３間に作動カム２４を挟むよ
うにして一体に設けられる。而して休止カム２２は，吸
気弁Ｖ2 を閉弁休止させるプロフィルを有するものであ
り，カム軸２１の軸線からの距離を一定とした形状に形
成される。また作動カム２４は，休止カム２２と同一半
径のベース円部２４ａと，該ベース円部２４ａから半径
方向外方に張出した高位部２４ｂとを有する。さらに実
質休止カム２３は，吸気弁Ｖ1 を実質的に休止させるプ
ロフィルを有するものであり，前記作動カム２４のベー
ス円部２４ａに対応したベース円部２３ａと，作動カム
２４の高位部２４ｂに対応する部分でベース円部２３ａ
から半径方向外方にわずかに張出した高位部２３ｂとを
有する。The camshaft 21 is rotatably disposed above the engine body E.
2. The substantial pause cam 23 and the operation cam 24 are provided integrally with the operation cam 24 interposed between the pause cam 22 and the substantial pause cam 23. Pause cam 22 Thus are those having a profile which is closed resting the intake valves V 2, is formed into a shape with a constant distance from the axis of the cam shaft 21. The operation cam 24 has a base circle portion 24a having the same radius as the rest cam 22, and a high-order portion 24b projecting radially outward from the base circle portion 24a. Further substantial pause cam 23, which has a profile that substantially resting the intake valves V 1, and the base circle portion 23a corresponding to the base circle portion 24a of the actuating cam 24, the higher portion 24b of the operation cam 24 Base circle part 23a at corresponding part
And a high portion 23b slightly projecting outward in the radial direction.
【００１２】第１，第２および第３ロッカアーム２５，
２６，２７は，第１および第３ロッカアーム２５，２７
間に第２ロッカアーム２６を挟むようにして相互に隣接
配置され，カム軸２１よりも下方で機関本体Ｅに回転自
在に支承される共通なロッカアーム軸２８に揺動自在に
支承される。しかも第１ロッカアーム２５に対応して実
質休止カム２３がカム軸２１に設けられ，第２ロッカア
ーム２６に対応して作動カム２４がカム軸２１に設けら
れ，第３ロッカアーム２７に対応して休止カム２２がカ
ム軸２１に設けられる。The first, second and third rocker arms 25,
26 and 27 are first and third rocker arms 25 and 27, respectively.
The second rocker arm 26 is disposed adjacent to each other with the second rocker arm 26 interposed therebetween, and is swingably supported by a common rocker arm shaft 28 rotatably supported by the engine main body E below the cam shaft 21. In addition, a substantially idle cam 23 is provided on the camshaft 21 corresponding to the first rocker arm 25, an operating cam 24 is provided on the camshaft 21 corresponding to the second rocker arm 26, and an idle cam corresponding to the third rocker arm 27. 22 is provided on the camshaft 21.
【００１３】第１および第３ロッカアーム２５，２７は
一対の吸気弁Ｖ1 ，Ｖ2 の上方位置まで延設されてお
り，第１および第３ロッカアーム２５，２７の端部に
は，各吸気弁Ｖ1 ，Ｖ2 の上端に当接し得るタペットね
じ２９，２９が進退可能に螺着される。一方，両吸気弁
Ｖ1 ，Ｖ2 の上部には鍔部３０，３０が設けられてお
り，これらの鍔部３０，３０と機関本体Ｅとの間には吸
気弁Ｖ1 ，Ｖ2 を囲繞する弁ばね３１…がそれぞれ介装
されており，弁ばね３１…により，各吸気弁Ｖ1 ，Ｖ2
は閉弁方向すなわち上方に向けて付勢されている。さら
に第２ロッカアーム２６は，機関本体Ｅとの間に設けら
れるロストモーション機構（図示せず）により，作動カ
ム２４に接触する方向に弾発付勢されている。The first and third rocker arms 25 and 27 extend to positions above the pair of intake valves V 1 and V 2 , and the end of each of the first and third rocker arms 25 and 27 has a respective intake valve. tappet screws 29 and 29 is screwed to be movable forward and backward, which may contact with the upper end of the V 1, V 2. On the other hand, the upper portion of the intake valves V 1, V 2 and the flange portion 30, 30 is provided, surrounding the intake valves V 1, V 2 between these flange portions 30, 30 and the engine body E , Respectively, are interposed, and each of the intake valves V 1 , V 2
Are urged in the valve closing direction, that is, upward. Further, the second rocker arm 26 is resiliently urged in a direction in which the second rocker arm 26 comes into contact with the operation cam 24 by a lost motion mechanism (not shown) provided between the second rocker arm 26 and the engine body E.
【００１４】第１，第２および第３ロッカアーム２５，
２６，２７は，それらの連結および連結解除の組合せを
連結切換手段３２で切換えられるものであり，該連結切
換手段３２は，一端を油圧室３３に臨ませて第１ロッカ
アーム２５に摺動可能に連結される切換ピストン３４
と，切換ピストン３４の他端に一端を当接させて第２ロ
ッカアーム２６に摺動可能に嵌合される切換ピン３５
と，切換ピン３５の他端に当接して第３ロッカアーム２
７に摺動自在に嵌合される規制部材３６と，前記油圧室
３３の油圧が２段階に増大するのに応じて切換ピストン
３４，切換ピン３５および規制部材３６の摺動ストロー
クを２段階に変化させることを可能としたばね力で規制
部材３６を前記油圧室３３側に付勢して第３ロッカアー
ム２７に設けられるばね付勢機構３７とを備える。The first, second and third rocker arms 25,
26, 27, the combination of connection and disconnection can be switched by the connection switching means 32. The connection switching means 32 is slidable on the first rocker arm 25 with one end facing the hydraulic chamber 33. Switching piston 34 to be connected
And a switching pin 35 slidably fitted to the second rocker arm 26 with one end contacting the other end of the switching piston 34.
And the other end of the switching pin 35 to make contact with the third rocker arm 2.
The regulating member 36, slidably fitted to 7, two steps the sliding stroke of the switching piston 34, the switching pin 35 and the regulating member 36 in response to hydraulic pressure of the hydraulic chamber 3 3 increases in two stages and a spring-loaded mechanism 37 which is provided with a regulating member 36 can with the spring force by changing the third rocker arm 27 is biased to the hydraulic chamber 3 3 side.
【００１５】第１ロッカアーム２５には，第２ロッカア
ーム２６側に開放した有底のガイド孔３８がロッカアー
ム軸２８と平行に穿設されており，このガイド孔３８に
切換ピストン３４が摺動可能に嵌合され，切換ピストン
３４の一端とガイド孔３８の閉塞端との間に油圧室３３
が画成される。しかも切換ピストン３４の軸方向長さ
は，油圧室３３の容積を図３で示すように最小とする位
置まで摺動している状態で，該切換ピストン３４の他端
が第１および第２ロッカアーム２５，２６間からガイド
孔３８側に引っ込んだ位置に在るように設定される。ま
た第１ロッカアーム２５には油圧室３３に連通する連通
路３９が穿設され，ロッカアーム軸２８に設けられた油
路４０（図１参照）が，第１ロッカアーム２５の揺動状
態にかかわらず前記連通路３９すなわち油圧室３３に常
時連通する。The first rocker arm 25 is provided with a bottomed guide hole 38 opened to the second rocker arm 26 side in parallel with the rocker arm shaft 28, and a switching piston 34 is slidable in the guide hole 38. The hydraulic chamber 33 is fitted between one end of the switching piston 34 and the closed end of the guide hole 38.
Is defined. Further, the axial length of the switching piston 34 is slid to a position where the volume of the hydraulic chamber 33 is minimized as shown in FIG. 3, and the other end of the switching piston 34 is connected to the first and second rocker arms. Guide between 25 and 26
It is set so as to be at a position retracted toward the hole 38 side. A communication passage 39 communicating with the hydraulic chamber 33 is formed in the first rocker arm 25, and an oil passage 40 (see FIG. 1) provided in the rocker arm shaft 28 is provided regardless of the swing state of the first rocker arm 25. It is always in communication with the communication passage 39, that is, the hydraulic chamber 33.
【００１６】第２ロッカアーム２６には，前記ガイド孔
３８に対応して両端を開放したガイド孔４１がロッカア
ーム軸２８と平行に穿設されており，円柱状に形成され
た切換ピン３５が該ガイド孔４１に摺動自在に嵌合され
る。しかも該切換ピン３５の軸方向長さＬは，その軸方
向一端部を第１ロッカアーム２５のガイド孔３８に距離
Ｌ1 だけ嵌合させた状態では，他端が第３ロッカアーム
２７と第２ロッカアーム２６との中間部に在るように設
定される。In the second rocker arm 26, a guide hole 41 having both ends opened corresponding to the guide hole 38 is formed in parallel with the rocker arm shaft 28, and a switching pin 35 formed in a columnar shape is provided with the guide hole 41. It is slidably fitted in the hole 41. Moreover the axial length L of said changeover switching pin 35 is in the state in which the and the one axial end portion so the distance L 1 only fitted in the guide hole 38 of the first rocker arm 25, the other end a third rocker arm 27 second rocker arm 26.
【００１７】第３ロッカアーム２７には，前記ガイド孔
４１に対応する小径ガイド孔４２と，段部４４を介して
小径ガイド孔４２に同軸に連なる大径ガイド孔４３とが
ロッカアーム軸２８と平行にして第２ロッカアーム２６
側から順に設けられ，有底円筒状に形成された規制部材
３６が小径ガイド孔４２に摺動自在に嵌合される。The third rocker arm 27 has a small-diameter guide hole 42 corresponding to the guide hole 41 and a large-diameter guide hole 43 coaxially connected to the small-diameter guide hole 42 via a step 44 so as to be parallel to the rocker arm shaft 28. Second rocker arm 26
A regulating member 36 provided in order from the side and having a bottomed cylindrical shape is slidably fitted in the small-diameter guide hole 42.
【００１８】ばね付勢機構３７は，有底円筒状に形成さ
れて第３ロッカアーム２７の大径ガイド孔４３に摺動自
在に嵌合される補助規制部材４５と，前記規制部材３６
および補助規制部材４５間に縮設される第１戻しばね４
６と，大径ガイド孔４３の外端寄りに嵌着されている止
め輪４７および補助規制部材４５間に縮設されている第
２戻しばね４８とを備え，第２戻しばね４８のばね力は
第１戻しばね４６のばね力よりも大きく設定されてい
る。また切換ピン３５との当接面を第２および第３ロッ
カアーム２６，２７の中間部に対応させた状態に在る規
制部材３６と，段部４４に当接した状態に在る補助規制
部材４４との間には，前記切換ピン３５の第１ロッカア
ーム２５への嵌合距離Ｌ1 と同一距離の間隔があけられ
ている。The spring biasing mechanism 37 is formed in a bottomed cylindrical shape and is slidably fitted in the large-diameter guide hole 43 of the third rocker arm 27;
And the first return spring 4 contracted between the auxiliary regulating members 45
6 and a second return spring 48 contracted between a retaining ring 47 fitted to the outer end of the large-diameter guide hole 43 and the auxiliary regulating member 45, and the spring force of the second return spring 48 is provided. Is set to be larger than the spring force of the first return spring 46. Further the regulating member 36 in a state where the contact surface is made to correspond to the middle portion of the second and third rocker arms 26, 27 of the switching pin 35, the auxiliary restricting member located in contact with the stepped portion 44 between 44, the spacing of the fitting distance L 1 and the same distance to the first rocker arm 25 of the switching pin 35 is opened.
【００１９】次にこの第１実施例の作用について説明す
ると，油圧室３３の油圧を解放した状態では，ばね付勢
機構３７が発揮するばね力により切換ピストン３４，切
換ピン３５および規制部材３６は油圧室３３側に最大限
移動した状態に在り，切換ピン３５の一端部は第１ロッ
カアーム２５のガイド孔３８に嵌合され，切換ピン３５
の他端および規制部材３６の当接面は第２および第３ロ
ッカアーム２６，２７間に在る。したがって第１および
第２ロッカアーム２５，２６は連結状態にあり，一方の
吸気弁Ｖ1 が作動カム２４のプロフィルに応じた特性で
開閉駆動されるのに対し，第２および第３ロッカアーム
２６，２７は連結解除状態に在るので，他方の吸気弁Ｖ
2 は休止カム２２により閉弁休止されている。Next, the operation of the first embodiment will be described. When the hydraulic pressure in the hydraulic chamber 33 is released, the switching piston 34, the switching pin 35 and the regulating member 36 are actuated by the spring force exerted by the spring biasing mechanism 37. One end of the switching pin 35 is fitted into the guide hole 38 of the first rocker arm 25, and the switching pin 35
And the contact surface of the regulating member 36 are located between the second and third rocker arms 26 and 27. Accordingly, the first and second rocker arms 25 and 26 is in the connected state, whereas the one of the intake valves V 1 is driven to be opened and closed with characteristics corresponding to the profile of the actuating cam 24, the second and third rocker arms 26, 27 Is in the disconnected state, the other intake valve V
2 is closed and stopped by the stop cam 22.
【００２０】次いで油圧室３３にばね付勢機構３７にお
ける第１戻しばね４６のばね力に打ち勝つだけの比較的
低圧の油圧を作用せしめると，切換ピストン３４は，第
１戻しばね４６を圧縮することにより段部４４に当接し
ている補助規制部材４５に規制部材３６を当接させるま
ですなわち距離Ｌ1 だけ移動し，それにより切換ピン３
５の一端および切換ピストン３４の当接面は第１および
第２ロッカアーム２５，２６間に位置し，切換ピン３５
の他端部は第３ロッカアーム２７の小径ガイド孔４２に
嵌合する。したがって第１および第２ロッカアーム２
５，２６は連結解除状態となり，一方の吸気弁Ｖ1 が実
質休止カム２３により実質休止状態となるのに対し，第
２および第３ロッカアーム２６，２７が連結されるのに
応じて他方の吸気弁Ｖ2 は作動カム２４のプロフィルに
応じた特性で開閉駆動されることになる。従って，油圧
室３３の油圧を解放するか或いは同油圧室３３に前記比
較的低圧の油圧を作用させるかに応じて，休止させるべ
き吸気弁Ｖ1 ，Ｖ2 を選択的に切換制御することが可能
となるので，一方の切換弁のみを休止にした場合に該弁
に燃料やカーボンが堆積してしまう不都合を効果的に抑
制できる。Next, when the hydraulic chamber 33 is acted upon by a relatively low pressure hydraulic pressure that overcomes the spring force of the first return spring 46 of the spring biasing mechanism 37, the switching piston 34 compresses the first return spring 46. As a result, the switching member 3 is moved by the distance L 1 until the regulating member 36 comes into contact with the auxiliary regulating member 45 that is in contact with the step portion 44.
5 and the contact surface of the switching piston 34 are located between the first and second rocker arms 25 and 26, and the switching pin 35
Is fitted into the small-diameter guide hole 42 of the third rocker arm 27. Therefore, the first and second rocker arms 2
5 and 26 are in a disconnected state, and one intake valve V 1 is substantially in a rest state by the substantial rest cam 23, whereas the other intake valve V 1 is in a rest state by the connection of the second and third rocker arms 26 and 27. The valve V 2 is driven to open and close with characteristics according to the profile of the operation cam 24. Therefore, it is possible to selectively control the switching of the intake valves V 1 and V 2 to be stopped depending on whether the hydraulic pressure in the hydraulic chamber 33 is released or the relatively low hydraulic pressure is applied to the hydraulic chamber 33. This makes it possible to effectively suppress the inconvenience of depositing fuel or carbon on one of the switching valves when only one of the switching valves is stopped.
【００２１】さらに油圧室３３にばね付勢機構３７にお
ける第１および第２戻しばね４６，４８のばね力に打ち
勝つだけの比較的高圧の油圧を作用せしめると，切換ピ
ストン３４は，第１戻しばね４６を圧縮して補助規制部
材４５に当接している規制部材３６を小径ガイド孔４２
にさらに押込むまで移動し，切換ピストン３４の他端部
が第２ロッカアーム２６のガイド孔４１に嵌合し，切換
ピン３５は，小径ガイド孔４２内にさらに押込まれるこ
とになる。したがって第１，第２および第３ロッカアー
ム２５，２６，２７が全て連結されることになり，両吸
気弁Ｖ1 ，Ｖ2は作動カム２４のプロフィルに応じた特
性で開閉駆動されることになる。Further, when the hydraulic chamber 33 is acted upon by a relatively high pressure oil pressure that overcomes the spring force of the first and second return springs 46 and 48 of the spring biasing mechanism 37, the switching piston 34 is turned on by the first return spring. The restricting member 36 which has compressed and is in contact with the auxiliary restricting member 45 is inserted into the small-diameter guide hole 42.
And the other end of the switching piston 34 is fitted into the guide hole 41 of the second rocker arm 26, and the switching pin 35 is further pushed into the small-diameter guide hole 42. Therefore, the first, second, and third rocker arms 25, 26, and 27 are all connected, and the two intake valves V 1 and V 2 are driven to open and close with characteristics according to the profile of the operating cam 24. .
【００２２】このような動弁装置によると，吸気弁
Ｖ1 ，Ｖ2 に連結されている第１および第３ロッカアー
ム２５，２７の少なくとも一方は，第２ロッカアーム２
６に連結されるものであり，連結切換手段３２が何らか
の理由によって不作動となっても両吸気弁Ｖ1 ，Ｖ2 が
両方とも実質休止および休止となってしまうことはな
い。また切換ピン３６は，円柱状の単純形状を有すれば
よく，加工が簡単となる。According to such a valve train, at least one of the first and third rocker arms 25 and 27 connected to the intake valves V 1 and V 2 is connected to the second rocker arm 2.
6, even if the connection switching means 32 becomes inactive for some reason, both of the intake valves V 1 and V 2 do not substantially stop and stop. Further, the switching pin 36 only has to have a simple cylindrical shape, and the processing is simplified.
【００２３】上記第１実施例において，実質休止カム２
３に変えて休止カム２２を用いるようにしても同様の効
果を奏することができる。In the first embodiment, the substantially pause cam 2
The same effect can be obtained even if the pause cam 22 is used instead of 3.
【００２４】図４は本発明の第２実施例を示すものであ
り，上記第１実施例に対応する部分には同一の参照符号
を付す。FIG. 4 shows a second embodiment of the present invention, in which parts corresponding to those in the first embodiment are denoted by the same reference numerals.
【００２５】ロッカアーム軸２８には，第１，第２およ
び第３ロッカアーム２５，２６，２７がこの順に隣接し
て揺動可能に支承されており，第１および第３ロッカア
ーム２５，２７には吸気弁Ｖ1 ，Ｖ2 がそれぞれ連動，
連結される。またカム軸２１には，第１，第２および第
３ロッカアーム２５，２６，２７にそれぞれ個別に対応
して，第１の休止カム２２ａ，作動カム２４及び第２の
休止カム２２ｂが一体に設けられる。[0025] The b Kkaamu shaft 28, first, second and third rocker arms 25, 26, 27 are swingably supported adjacent in this order, the first and third rocker arms 25, 27 The intake valves V 1 and V 2 are interlocked,
Be linked. The cam shaft 21 is provided with a first pause cam 22a, an operation cam 24, and a second pause cam 22b integrally corresponding to the first, second, and third rocker arms 25, 26, 27, respectively. Can be
【００２６】第１〜第３ロッカアーム２５〜２７の連結
および連結解除の組合せは連結切換手段８４2 で切換え
られるものであり，該連結切換手段８４2 は，第１ロッ
カアーム２５のガイド孔に摺動可能に嵌合されて外端を
第１油圧室８５に臨ませる第１切換ピストン８７2 と，
第３ロッカアーム２７のガイド孔に摺動可能に嵌合され
て外端を第２油圧室８６に臨ませる第２切換ピストン８
８2 と，第２ロッカアーム２６のガイド孔に摺動可能に
嵌合されて第１切換ピストン８７2 に連接される第１切
換部材８９と，第２ロッカアーム２６のガイド孔に摺動
可能に嵌合されて第２切換ピストン８８2 に連接される
第２切換部材９０と，第１および第２切換部材８９，９
０間に介設されるばね付勢手段としての戻しばね９１と
を備えている。 [0026] The combination of the coupling and uncoupling of the first to third rocker arms 25 to 27 are those to be switched in coupling switching means 84 2, the connection switching means 84 2, sliding in the guide hole of the first rocker arm 25 a first switching piston 87 2 for exposing allow fitted to the first hydraulic chamber 85 to the outer end, the
The second switching piston 8 that is slidably fitted in the guide hole of the third rocker arm 27 so that the outer end faces the second hydraulic chamber 86.
8 and 2, the first switching member 89 which is connected slidably to the first switch piston 87 is fitted 2 in the guide hole of the second rocker arm 26, sliding in the guide hole of the second rocker arm 26
Capable and second switching member 90 which is connected is fitted to the second switching piston 88 2, first and second switching member 89,9
And a return spring 91 as a spring urging means interposed between zero .
【００２７】第２ロッカアーム２６のガイド孔内周に
は，第１および第２切換部材８９，９０の相互に近接す
る方向への移動端を規制する止め輪１０２が嵌着されて
おり，この止め輪１０２は，その一側面で第１切換部材
８９の第２切換部材９０側への移動限界位置を規定し，
またその他側面で第２切換部材９０の第１切換部材８９
側への移動限界位置を規定するもので，本発明のストッ
パ手段を構成する。 A retaining ring 102 is fitted on the inner periphery of the guide hole of the second rocker arm 26 to restrict the moving ends of the first and second switching members 89 and 90 in the direction approaching each other.
The retaining ring 102 has a first switching member on one side thereof.
89, the limit position of movement to the second switching member 90 side is defined,
Also, on the other side, the first switching member 89 of the second switching member 90
It defines the limit position for movement to the side.
Constituting means.
【００２８】第１および第２切換ピストン８７2 ，８８
2 は，それぞれ短円柱状に形成されており，第１および
第２油圧室８５，８６の容積を最小とした位置に第１お
よび第２切換ピストン８７2 ，８８2 が在るときには，
第１および第２切換部材８９，９０は，それらの一部を
第１および第３ロッカアーム２５，２７にそれぞれ嵌合
している。First and second switching pistons 87 2 , 88
2 is formed on each short columnar shape, when the first and second switching piston 87 2, 88 2 is in the position of the minimum volume of the first and second hydraulic chambers 85 and 86,
A part of the first and second switching members 89 and 90 is fitted to the first and third rocker arms 25 and 27, respectively.
【００２９】而して第１および第２油圧室８５，８６の
油圧が解放されている状態では，図４で示すように第１
および第２切換部材８９，９０がそれらの一部を第１お
よび第３ロッカアーム２５，２７にそれぞれ嵌合した状
態にあって，全ロッカアーム２５〜２７が連結されてい
る。したがって両吸気弁Ｖ1 ，Ｖ2 は作動カム２４のプ
ロフィルに応じた特性で開閉作動する。また第２油圧室
８６の油圧を解放した状態で第１油圧室８５に油圧を作
用せしめると，第１切換ピストン８７2 は，第１切換部
材８９との当接面が第１および第２ロッカアーム２５，
２６間に位置するように第１切換部材８９を押圧し，第
１および第２ロッカアーム２５，２６の連結が解除され
る。したがって，一方の吸気弁Ｖ1 が休止カム２２によ
って休止されるのに対し，他方の吸気弁Ｖ2 は，第２お
よび第３ロッカアーム２６，２７が連結された状態にあ
るので作動カム２４のプロフィルに応じた特性で開閉駆
動される。また第１油圧室８５の油圧を解放した状態で
第２油圧室８６に油圧を作用せしめると，第２切換ピス
トン８８2 は，第２切換部材９０との当接面が第２およ
び第３ロッカアーム２６，２７間に位置するように第２
切換部材９０を押圧し，第２および第３ロッカアーム２
６，２７の連結が解除され，第１および第２ロッカアー
ム２５，２６は，戻しばね９１のばね力により第１切換
部材８９の一部が第１ロッカアーム２５に嵌合するの
で，連結状態となる。したがって，一方の吸気弁Ｖ1 が
作動カム２４のプロフィルに応じた特性で開閉駆動され
るのに対し，他方の吸気弁Ｖ2 は休止カム２２により休
止される。さらに第１および第２油圧室８５，８６にと
もに油圧を作用せしめると，第１および第２切換ピスト
ン８７2 ，８８2 は，第１および第２切換部材８９，９
０を戻しばね９１のばね力に抗して止め輪１０２に当接
するまで押圧移動せしめ，第１切換ピストン８７2およ
び第１切換部材８９の当接面が第１および第２ロッカア
ーム２５，２６間に位置するようになり，第２切換ピス
トン８８2 および第２切換部材９０の当接面が第２およ
び第３ロッカアーム２６，２７間に位置するようにな
り，各ロッカアーム２５〜２７の連結が解除される。し
たがって両吸気弁Ｖ1 ，Ｖ2 は休止カム２２，２２によ
りともに休止される。When the hydraulic pressure in the first and second hydraulic chambers 85 and 86 is released, the first hydraulic chamber 85 and the first hydraulic chamber 85 are released as shown in FIG.
All the rocker arms 25 to 27 are connected with the first and third rocker arms 25 and 27 in a state where a part thereof is fitted to the second switching members 89 and 90, respectively. Therefore, both intake valves V 1 and V 2 are opened and closed with characteristics according to the profile of the operation cam 24. Further, when exerting a pressure to the first hydraulic pressure chamber 85 in a state of releasing the hydraulic pressure of the second hydraulic chamber 86, the first switching piston 87 2, abutment surfaces of the first switching member 89 is first and second rocker arms 25,
The first switching member 89 is pressed so as to be located between the first and second rocker arms 26 and 26, and the connection between the first and second rocker arms 25 and 26 is released. Thus, whereas one of the intake valves V 1 is being paused by pause cam 22, the other intake valve V 2 is the profile of the actuating cam 24 since the state where the second and third rocker arms 26, 27 are coupled Is driven to open and close with the characteristics according to. Further, when exerting a pressure to the second hydraulic chamber 86 in a state of releasing the hydraulic pressure of the first hydraulic chamber 85, the second switching piston 88 2, the abutment surface of the second switching member 90 and the second and third rocker arms The second so as to be located between 26 and 27
By pressing the switching member 90, the second and third rocker arms 2 are pressed.
The connection between the first and second rocker arms 25 and 26 is released, and a part of the first switching member 89 is fitted to the first rocker arm 25 by the spring force of the return spring 91, so that the first and second rocker arms 25 and 26 are connected. . Therefore, while one intake valve V 1 is driven to open and close with characteristics according to the profile of the operation cam 24, the other intake valve V 2 is stopped by the stop cam 22. When exerting together hydraulic further to the first and second hydraulic chambers 85 and 86, first and second switching piston 87 2, 88 2, first and second switching member 89,9
0 back against the spring force of the spring 91 allowed to push the movement until it abuts against the retaining ring 102, the contact surface of the first switching piston 87 2 and the first switching member 89 between the first and second rocker arms 25 and 26 will be positioned, the abutment surface of the second switching piston 88 2 and the second switching member 90 is now located between the second and third rocker arms 26 and 27, connecting the release of the rocker arms 25 to 27 Is done. Accordingly, both intake valves V 1 and V 2 are stopped by the stop cams 22 and 22.
【００３０】かくして，この実施例でも，油圧室８５，
８６への選択的な油圧供給に応じて，休止させるべき吸
気弁Ｖ1 ，Ｖ2 を選択的に切換制御することが可能とな
るので，一方の切換弁のみを休止にした場合に該弁に燃
料やカーボンが堆積してしまう不都合を効果的に抑制で
きる。Thus, also in this embodiment, the hydraulic chamber 85,
It is possible to selectively control the switching of the intake valves V 1 and V 2 to be stopped according to the selective supply of hydraulic pressure to the valve 86. The inconvenience that fuel and carbon are deposited can be effectively suppressed.
【００３１】以上，本発明の実施例を詳述したが，本発
明は上記実施例に限定されるものではなく，特許請求の
範囲に記載された本発明を逸脱することなく種々の設計
変更を行なうことが可能である。Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.
【００３２】たとえば本発明を排気弁の動弁装置に適用
することも可能である。For example, the present invention can be applied to a valve gear for an exhaust valve.
【００３３】[0033]
【発明の効果】以上のように請求項１，２の各発明によ
れば，切換部材（切換ピン，切換ピストン）の形状を単
純形状として加工を容易とすることができ，その上，第
１，第２機関弁のうち休止可能な機関弁を選択的に切換
制御可能として，一方の機関弁だけに燃料やカーボンが
偏って堆積することを効果的に抑制できる。As described above, according to each of the first and second aspects of the present invention, the shape of the switching member (switching pin, switching piston) can be made simple to facilitate the machining. Of the second engine valves, the engine valves that can be stopped can be selectively switched and controlled, so that the uneven accumulation of fuel or carbon on only one of the engine valves can be effectively suppressed.
【００３４】また請求項１の発明によれば，第１，第２
機関弁に連動，連結される第１および第３ロッカアーム
の少なくとも一方を，その中間の第２ロッカアームに必
ず連結できるため，第１，第２機関弁とも休止状態とな
ってしまう事態を確実に回避できる。According to the first aspect of the present invention, the first and second
At least one of the first and third rocker arms interlocked with and connected to the engine valve can be connected to the intermediate second rocker arm without fail, so that the situation in which both the first and second engine valves are stopped can be reliably avoided. it can.
【００３５】また請求項２の発明によれば，ロッカアー
ム相互の連結および連結解除の組合せの自由度を増大さ
せることができる。Further, according to the second aspect of the present invention, the degree of freedom of the combination of the connection and disconnection of the rocker arms can be increased.
【図１】第１実施例の縦断側面図である。FIG. 1 is a longitudinal sectional side view of a first embodiment.
【図２】図１の２−２線矢視平面図である。FIG. 2 is a plan view taken along line 2-2 of FIG. 1;
【図３】図１の３−３線断面図である。FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;
【図４】第２実施例の図３に対応した断面図である。FIG. 4 is a sectional view corresponding to FIG. 3 of a second embodiment.
２１・・・カム軸 ２２・・・休止カム（第２の休止カム） ２２ａ・・休止カム（第１の休止カム） ２２ｂ・・休止カム（第２の休止カム） ２３・・・実質休止カム（第１の休止カム） ２４・・・作動カム ２５・・・第１ロッカアーム ２６・・・第２ロッカアーム ２７・・・第３ロッカアーム ３２，８４2 ・・・連結切換手段 ３３・・・油圧室 ３４・・・切換ピストン ３５・・・切換ピン ３６・・・規制部材 ３７・・・ばね付勢機構 ３８，４１，４２・・・ガイド孔 ８５・・・第１油圧室 ８６・・・第２油圧室 ８７2 ・・・第１切換ピストン ８８2 ・・・第２切換ピストン ８９・・・第１切換部材 ９０・・・第２切換部材９１・・・ばね付勢手段としての戻しばね １０２・・ストッパ手段としての止め輪 Ｖ1 ，Ｖ2 ・・・機関弁としての吸気弁21 cam shaft 22 pause cam (second pause cam) 22a pause cam (first pause cam) 22b pause cam (second pause cam) 23 substantial pause cam (1st rest cam) 24 ... Working cam 25 ... 1st rocker arm 26 ... 2nd rocker arm 27 ... 3rd rocker arm 32,84 2 ... Connection switching means 33 ... Hydraulic chamber 34 ... switching piston 35 ... changeover pins 36 ... restricting member 37 ... spring-biased Organization 38,41,42 ... guide hole 85 ... first hydraulic chamber 86 ... first 2 hydraulic chamber 87 2 ... first switching piston 88 2 ... second switching piston 89 ... first switching member 90 ... second switching member 91 ... return spring 102 as spring urging means ... and snap ring V 1, V 2 ··· engine valve as a stopper means Of the intake valve
フロントページの続き (56)参考文献 特開 平２−223613（ＪＰ，Ａ) 特開 平５−5408（ＪＰ，Ａ) 特開 平３−149306（ＪＰ，Ａ) 特開 昭63−100210（ＪＰ，Ａ) 特開 平２−221611（ＪＰ，Ａ) 特開 昭64−45911（ＪＰ，Ａ) 実開 昭61−84106（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F01L 13/00 301 Continuation of the front page (56) References JP-A-2-223613 (JP, A) JP-A-5-5408 (JP, A) JP-A-3-149306 (JP, A) JP-A-63-100210 (JP) JP-A-2-221611 (JP, A) JP-A-64-45911 (JP, A) JP-A-61-84106 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB Name) F01L 13/00 301
Claims (2)
第１ロッカアーム（２５）と，この第１ロッカアーム
（２５）に隣接配置された第２ロッカアーム（２６）
と，第２機関弁（Ｖ2 ）に連動，連結されて第１ロッカ
アーム（２５）とは反対側で第２ロッカアーム（２６）
に隣接配置された第３ロッカアーム（２７）とが，揺動
軸線を共通にして機関本体（Ｅ）に揺動可能に支持さ
れ，その第１ロッカアーム（２５）に対応した第１の休
止カム（２３）と，第２ロッカアーム（２６）に対応し
た作動カム（２４）と，第３ロッカアーム（２７）に対
応した第２の休止カム（２２）とが共通のカム軸（２
１）に設けられ，各ロッカアーム（２５〜２７）の連結
および連結解除の組合せを連結切換手段（３２）により
切換可能とした内燃機関の動弁装置であって， 連結切換手段（３２）は，第１ロッカアーム（２５）の
ガイド孔（３８）に摺動自在に嵌合されて一端を油圧室
（３３）に臨ませた切換ピストン（３４）と，第２ロッ
カアーム（２６）の両端開放のガイド孔（４１）よりも
長く形成されてそのガイド孔（４１）に摺動自在に嵌合
されると共に切換ピストン（３４）の他端に一端を当接
させる切換ピン（３５）と，第３ロッカアーム（２７）
のガイド孔（４２）に摺動自在に嵌合されるとともに切
換ピン（３５）の他端に当接される規制部材（３６）
と，切換ピストン（３４），切換ピン（３５）及び規制
部材（３６）が，油圧室（３３）の油圧解放状態では油
圧室３３側に最大限後退した第１切換位置に，また油圧
室（３３）への比較的低圧の油圧作用状態では第１切換
位置から所定距離（Ｌ 1 ）前進移動した第２切換位置
に，更に比較的高圧の油圧作用状態では第２切換位置か
ら更に前進移動した第３切換位置にそれぞれ切換わるこ
とを可能としたばね力で規制部材（３６）を油圧室（３
３）側に付勢して第３ロッカアーム（２７）に設けられ
るばね付勢機構（３７）とを備え，切換ピストン（３４），切換ピン（３５）及び規制部材
（３６）は，それらが第１切換位置にあるときには，切
換ピン（３５）の一端が第１ロッカアーム（２５）のガ
イド孔（３８）に嵌合し且つ切換ピン（３５）の他端お
よび規制部材（ ３６）の当接面が第２および第３ロッカ
アーム（２６，２７）間に位置しており，また第２切換
位置にあるときには，切換ピン（３５）の一端および切
換ピストン（３４）の当接面が第１および第２ロッカア
ーム（２５，２６）間に位置し且つ切換ピン（３５）の
他端が第３ロッカアーム（２７）のガイド孔（４２）に
嵌合しており，さらに第３切換位置にあるときには，切
換ピストン（３４）の他端が第２ロッカアーム（２６）
のガイド孔（４１）に嵌合し且つ切換ピン（３５）の他
端が第３ロッカアーム（２７）のガイド孔（４２）内に
嵌合している ことを特徴とする，内燃機関の動弁装置。1. A first rocker arm (25) interlocked with and connected to a first engine valve (V 1 ), and a second rocker arm (26) disposed adjacent to the first rocker arm (25).
When the second engine valve (V 2) to the interlocking, the second rocker arm opposite the connection has been first rocker arm (25) (26)
And a third rocker arm (27) disposed adjacent to the first rocker arm (25), which is swingably supported by the engine body (E) with a common swing axis, and a first rest cam (25) corresponding to the first rocker arm (25). 23), an operating cam (24) corresponding to the second rocker arm (26), and a second rest cam (22) corresponding to the third rocker arm (27).
1) a valve operating device for an internal combustion engine, wherein a combination of connection and disconnection of each rocker arm (25 to 27) can be switched by a connection switching means (32); the first rocker arm (25)
The switching piston (34) slidably fitted in the guide hole (38) and having one end facing the hydraulic chamber (33), and the guide hole (41) opened at both ends of the second rocker arm (26).
A switching pin to abut the other end to one end of the long-formed slidably fitted Rutotomoni switching piston to the guide hole (41) (34) (35), third rocker arm (27)
A regulating member (36) which is slidably fitted in the guide hole (42) and abuts on the other end of the switching pin (35).
, Switching piston (34), switching pin (35) and regulation
When the member (36) releases the hydraulic pressure in the hydraulic chamber (33),
In the first switching position, which has been retracted as far as possible to the pressure chamber 33 side,
In the state of relatively low pressure hydraulic operation to the chamber (33), the first switching is performed.
The second switching position that has moved forward by a predetermined distance (L 1 ) from the position
In addition, when the hydraulic pressure is relatively high, the second switching position
Et further enables the respective switching replace this <br/> the third switching position moved forward with the regulation by the spring force member (36) a hydraulic chamber (3
A spring biasing mechanism (37) provided on the third rocker arm (27) by being biased toward the 3) side, comprising a switching piston (34), a switching pin (35), and a regulating member.
(36) switches off when they are in the first switching position.
One end of the replacement pin (35) is fitted to the first rocker arm (25).
And the other end of the switching pin (35).
And the contact surfaces of the regulating member ( 36) are the second and third rockers.
It is located between the arms (26, 27) and has a second switch
When in the position, one end of the switching pin (35) and
The contact surface of the replacement piston (34) has first and second rockers.
(25, 26) and between the switching pin (35)
The other end is inserted into the guide hole (42) of the third rocker arm (27).
When engaged and in the third switching position,
The other end of the replacement piston (34) is the second rocker arm (26).
Other than the switching pin (35)
The end is in the guide hole (42) of the third rocker arm (27).
A valve gear for an internal combustion engine, which is fitted .
第１ロッカアーム（２５）と，この第１ロッカアーム
（２５）に隣接配置された第２ロッカアーム（２６）
と，第２機関弁（Ｖ2 ）に連動，連結されて第１ロッカ
アーム（２５）とは反対側で第２ロッカアーム（２６）
に隣接配置された第３ロッカアーム（２７）とが，揺動
軸線を共通にして機関本体（Ｅ）に揺動可能に支持さ
れ，その第１ロッカアーム（２５）に対応した第１の休
止カム（２２ａ）と，第２ロッカアーム（２６）に対応
した作動カム（２４）と，第３ロッカアーム（２７）に
対応した第２の休止カム（２２ｂ）とが共通のカム軸
（２１）に設けられ，各ロッカアーム（２５〜２７）の
連結および連結解除の組合せを連結切換手段（８４2 ）
により切換可能とした内燃機関の動弁装置であって， 連結切換手段（８４2 ）は，第１ロッカアーム（２５）
に摺動自在に嵌合されて外端を第１油圧室（８５）に臨
ませる第１切換ピストン（８７2 ）と，第３ロッカアー
ム（２７）に摺動自在に嵌合されて外端を第２油圧室
（８６）に臨ませる第２切換ピストン（８８2 ）と，第
２ロッカアーム（２６）に摺動自在に嵌合されて第１切
換ピストン（８７2 ）の内端に一端が当接する第１切換
部材（８９）と，同じく第２ロッカアーム（２６）に摺
動自在に嵌合されて第２切換ピストン（８８2 ）の内端
に一端が当接する第２切換部材（９０）と，第２ロッカ
アーム（２６）に設けられて第１切換部材（８９）を第
１切換ピストン（８７ 2 ）側へ付勢し，また第２切換部
材（９０）を第２切換ピストン（８８ 2 ）側へ付勢する
ばね付勢手段（９１）と，第２ロッカアーム（２６）に
設けられて第１切換部材（８９）の第２切換部材（９
０）側への移動限界位置を規定し，また第２切換 部材
（９０）の第１切換部材（８９）側への移動限界位置を
規定するストッパ手段（１０２）とを備え，第１油圧室（８５）の油圧解放状態では，ばね付勢手段
（９１）の付勢力で，第１切換部材（８９）が第１及び
第２ロッカアーム（２５，２６）の両方に嵌合する位置
に保持され， また第１油圧室（８５）の油圧作用状態では，その油圧
で第１切換部材（８９）がそれの前記移動限界位置に保
持されて，該第１切換部材（８９）と第１切換ピストン
（８７ 2 ）との当接面を第１および第２ロッカアーム
（２５，２６）間に位置させ， 更に第２油圧室（８６）の油圧解放状態では，ばね付勢
手段（９１）の付勢力で，第２切換部材（９０）が第２
及び第３ロッカアーム（２６，２７）の両方に嵌合する
位置に保持され， 更にまた第２油圧室（８６）の油圧作用状態では，その
油圧で第２切換部材（９０）がそれの前記移動限界位置
に保持されて，該第２切換部材（９０）と第２切換ピス
トン（８８ 2 ）との当接面を第２及び第３ロッカアーム
（２６，２７）間に位置させるようにした ことを特徴と
する，内燃機関の動弁装置。2. A first rocker arm (25) interlocked with and connected to a first engine valve (V 1 ), and a second rocker arm (26) arranged adjacent to the first rocker arm (25).
When the second engine valve (V 2) to the interlocking, the second rocker arm opposite the connection has been first rocker arm (25) (26)
And a third rocker arm (27) disposed adjacent to the first rocker arm (25), which is swingably supported by the engine body (E) with a common swing axis, and a first rest cam (25) corresponding to the first rocker arm (25). 22a), an operation cam (24) corresponding to the second rocker arm (26), and a second pause cam (22b) corresponding to the third rocker arm (27) are provided on a common camshaft (21). connection switching means a combination of the coupling and uncoupling of the rocker arms (25-27) (84 2)
A valve operating device switchable between an internal combustion engine, the connection switching means (84 2), the first rocker arm (25)
A first switching piston (87 2 ) slidably fitted to the first hydraulic chamber (85) and an outer end slidably fitted to the third rocker arm (27). A second switching piston (88 2 ) facing the second hydraulic chamber (86) is slidably fitted to the second rocker arm (26), and one end of the first switching piston (87 2 ) is applied to the inner end of the first switching piston (87 2 ). contact first switching member and (89), also second sliding the rocker arm (26)
Inner end of second switching piston (88 2 ) movably fitted
A second switching member (90) having one end abutting on the second rocker;
The first switching member (89) provided on the arm (26)
The first switching piston (87 2 ) is urged toward the second switching portion.
The member (90) is urged toward the second switching piston (88 2 ).
The spring biasing means (91) and the second rocker arm (26)
The second switching member (9) of the first switching member (89)
0), and a second switching member.
The movement limit position of (90) toward the first switching member (89) is
And a stopper means (102) for regulating the pressure of the first hydraulic chamber (85).
With the urging force of (91), the first switching member (89) causes the first
Position to be fitted to both of the second rocker arms (25, 26)
And in the hydraulic working state of the first hydraulic chamber (85),
To keep the first switching member (89) in its movement limit position.
The first switching member (89) and the first switching piston
(87 2 ) with the first and second rocker arms
(25, 26), and when the hydraulic pressure in the second hydraulic chamber (86) is released, the spring is
With the urging force of the means (91), the second switching member (90)
And both the third rocker arms (26, 27)
Position, and furthermore, in the hydraulic working state of the second hydraulic chamber (86),
Hydraulically move the second switching member (90) to its movement limit position
And the second switching member (90) and the second switching
The contact surface with the ton (88 2 ) is the second and third rocker arms.
A valve train for an internal combustion engine, wherein the valve train is located between (26, 27) .
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32841793A JP3354251B2 (en) | 1993-12-24 | 1993-12-24 | Valve train for internal combustion engine |
| DE69408959T DE69408959T2 (en) | 1993-12-24 | 1994-12-23 | Valve train arrangement for an internal combustion engine |
| EP94120563A EP0661417B1 (en) | 1993-12-24 | 1994-12-23 | Valve operating device for internal combustion engine |
| US08/364,337 US5553584A (en) | 1993-12-24 | 1994-12-27 | Valve operating device for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32841793A JP3354251B2 (en) | 1993-12-24 | 1993-12-24 | Valve train for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07180518A JPH07180518A (en) | 1995-07-18 |
| JP3354251B2 true JP3354251B2 (en) | 2002-12-09 |
Family
ID=18210033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32841793A Expired - Fee Related JP3354251B2 (en) | 1993-12-24 | 1993-12-24 | Valve train for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3354251B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101241602B1 (en) * | 2007-11-20 | 2013-03-08 | 현대자동차주식회사 | 5 Step Variable Valve Lift System |
| JP5372611B2 (en) * | 2009-06-09 | 2013-12-18 | 株式会社ケーヒン | Engine intake control device |
-
1993
- 1993-12-24 JP JP32841793A patent/JP3354251B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07180518A (en) | 1995-07-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |